[PlaygroundTransform] Implemented support for defer statements.
[PlaygroundTransform] Implemented support for defer statements.

Added handling of `defer` statements in the playground transform.
Tests will be added in a follow-on commit.

Patch by Roman Levenstein!

This addresses SR-5641/<rdar://problem/33764082>.

natecook1000/swift,devincoughlin/swift,tkremenek/swift,jopamer/swift,shahmishal/swift,brentdax/swift,atrick/swift,ahoppen/swift,devincoughlin/swift,glessard/swift,xedin/swift,danielmartin/swift,shahmishal/swift,brentdax/swift,aschwaighofer/swift,airspeedswift/swift,tjw/swift,glessard/swift,hooman/swift,apple/swift,austinzheng/swift,gribozavr/swift,airspeedswift/swift,aschwaighofer/swift,JGiola/swift,austinzheng/swift,lorentey/swift,huonw/swift,hooman/swift,xwu/swift,karwa/swift,CodaFi/swift,austinzheng/swift,alblue/swift,stephentyrone/swift,karwa/swift,hooman/swift,aschwaighofer/swift,CodaFi/swift,lorentey/swift,shajrawi/swift,allevato/swift,JGiola/swift,jopamer/swift,benlangmuir/swift,stephentyrone/swift,karwa/swift,glessard/swift,tkremenek/swift,rudkx/swift,amraboelela/swift,nathawes/swift,lorentey/swift,zisko/swift,xwu/swift,austinzheng/swift,sschiau/swift,apple/swift,JGiola/swift,natecook1000/swift,shahmishal/swift,hooman/swift,jckarter/swift,xwu/swift,benlangmuir/swift,JGiola/swift,atrick/swift,lorentey/swift,jckarter/swift,harlanhaskins/swift,jckarter/swift,stephentyrone/swift,allevato/swift,practicalswift/swift,allevato/swift,natecook1000/swift,shajrawi/swift,rudkx/swift,CodaFi/swift,CodaFi/swift,aschwaighofer/swift,nathawes/swift,jopamer/swift,rudkx/swift,amraboelela/swift,gribozavr/swift,aschwaighofer/swift,danielmartin/swift,aschwaighofer/swift,practicalswift/swift,huonw/swift,sschiau/swift,tjw/swift,ahoppen/swift,austinzheng/swift,tjw/swift,shahmishal/swift,xwu/swift,danielmartin/swift,JGiola/swift,aschwaighofer/swift,natecook1000/swift,brentdax/swift,sschiau/swift,amraboelela/swift,sschiau/swift,xedin/swift,danielmartin/swift,ahoppen/swift,zisko/swift,parkera/swift,roambotics/swift,parkera/swift,glessard/swift,jopamer/swift,jckarter/swift,practicalswift/swift,stephentyrone/swift,zisko/swift,alblue/swift,tkremenek/swift,tjw/swift,airspeedswift/swift,airspeedswift/swift,practicalswift/swift,tkremenek/swift,shajrawi/swift,ahoppen/swift,ahoppen/swift,amraboelela/swift,nathawes/swift,rudkx/swift,danielmartin/swift,sschiau/swift,brentdax/swift,zisko/swift,natecook1000/swift,xedin/swift,harlanhaskins/swift,xedin/swift,tjw/swift,zisko/swift,shajrawi/swift,parkera/swift,harlanhaskins/swift,allevato/swift,huonw/swift,benlangmuir/swift,huonw/swift,alblue/swift,gregomni/swift,parkera/swift,benlangmuir/swift,parkera/swift,CodaFi/swift,brentdax/swift,rudkx/swift,roambotics/swift,xwu/swift,xwu/swift,karwa/swift,sschiau/swift,sschiau/swift,lorentey/swift,zisko/swift,tjw/swift,gregomni/swift,parkera/swift,allevato/swift,CodaFi/swift,jopamer/swift,gribozavr/swift,jckarter/swift,glessard/swift,devincoughlin/swift,tkremenek/swift,devincoughlin/swift,amraboelela/swift,gribozavr/swift,hooman/swift,lorentey/swift,jmgc/swift,natecook1000/swift,JGiola/swift,parkera/swift,jckarter/swift,tkremenek/swift,shajrawi/swift,huonw/swift,rudkx/swift,jmgc/swift,CodaFi/swift,jopamer/swift,gribozavr/swift,apple/swift,tjw/swift,xwu/swift,harlanhaskins/swift,xedin/swift,shajrawi/swift,sschiau/swift,devincoughlin/swift,karwa/swift,stephentyrone/swift,alblue/swift,gribozavr/swift,apple/swift,shahmishal/swift,jopamer/swift,harlanhaskins/swift,atrick/swift,stephentyrone/swift,danielmartin/swift,jmgc/swift,amraboelela/swift,austinzheng/swift,shahmishal/swift,nathawes/swift,roambotics/swift,apple/swift,allevato/swift,amraboelela/swift,jmgc/swift,jmgc/swift,gregomni/swift,airspeedswift/swift,practicalswift/swift,atrick/swift,huonw/swift,xedin/swift,gribozavr/swift,zisko/swift,atrick/swift,atrick/swift,brentdax/swift,lorentey/swift,devincoughlin/swift,glessard/swift,tkremenek/swift,xedin/swift,natecook1000/swift,alblue/swift,ahoppen/swift,shahmishal/swift,practicalswift/swift,lorentey/swift,karwa/swift,harlanhaskins/swift,practicalswift/swift,danielmartin/swift,shahmishal/swift,benlangmuir/swift,devincoughlin/swift,stephentyrone/swift,shajrawi/swift,austinzheng/swift,gregomni/swift,devincoughlin/swift,jmgc/swift,airspeedswift/swift,huonw/swift,alblue/swift,karwa/swift,gregomni/swift,roambotics/swift,parkera/swift,apple/swift,xedin/swift,practicalswift/swift,hooman/swift,roambotics/swift,hooman/swift,roambotics/swift,nathawes/swift,gregomni/swift,gribozavr/swift,jmgc/swift,alblue/swift,harlanhaskins/swift,karwa/swift,jckarter/swift,brentdax/swift,allevato/swift,airspeedswift/swift,shajrawi/swift,nathawes/swift,benlangmuir/swift,nathawes/swift